Serious Sam 4: Planet Badass Revealed

Devolver Digital takes the wraps off plans for Serious Sam 4: Planet Badass, saying a
new installment in the run-and-gun shooter series is in the works at Croteam. They
say this will be officially announced at E3, and in the meantime they offer
this teaser trailer,
which implies this is more of an open-world game that prior installments. There
is also already a
Steam listing for this you can add to your wishlist. There's not much there,
but the short description supports that open-world notion, saying, "Featuring
the world-renowned signature Serious Sam gameplay on a brutally bigger scale,
and not a single desert level, Planet Badass will make its debut @ E3 2018."
There's a little more in their announcement of plans for an announcement:

Serious
Sam 4: Planet Badass reignites the legendary series and elevates the iconic
full-throttle action, massive hordes of enemies, and explosive array of weapons
to the next level. Please join Croteam and Devolver Digital at E3 2018 for the
full game reveal and wishlist now on Steam for the latest news and update on
Serious Sam 4: Planet Badass.